Location:

M 7.8 215 km SW of Sungai Penuh, Indonesia

Magnitude:

7.8

Time:

25 Oct 2010 14:42:22

Depth:

20.1

There are 5 swarms found nearby.

2007

PS20070924.1(82.8km)

23 Sep

15 hours

8 earthquakes

PS20071021.1(74.6km)

21 Oct

3 hours

6 earthquakes

2010

PS20101025.1(34.7km)

25 Oct

1 day 13 hours

14 earthquakes

2019

PS20190202.1(67.2km)

2 Feb

4 hours

7 earthquakes

2020

PS20201019.1(54.9km)

18 Oct

17 hours

5 earthquakes

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The 2010 Mentawai Earthquake and Sumatran Tectonics

On 25 October 2010 at 14:42 local time, a magnitude 7.8 earthquake struck approximately 215 km southwest of Sungai Penuh in Jambi Province, Indonesia. The event originated at a depth of 20.1 km and was centered in the offshore Mentawai region along the Sunda subduction zone.

This earthquake resulted from thrust faulting on the plate boundary where the Indo-Australian Plate subducts beneath the Eurasian Plate. The Sumatran segment of this margin accommodates oblique convergence through both subduction and strike-slip motion along the Great Sumatran Fault. Sungai Penuh lies inland on the Barisan Mountains, a volcanic arc formed by this ongoing subduction. The 20.1 km focal depth placed the rupture within the seismogenic zone capable of generating significant seafloor displacement.

The broader geological setting features the Mentawai Islands as an outer-arc ridge uplifted by repeated megathrust events. Historical records document large earthquakes in 1797, 1833, and 1861 along adjacent segments. The 2010 event ruptured a shallower portion of the plate interface, producing a tsunami that affected coastal villages in the Mentawai Islands.

Since 2000, the M7.8 earthquake remains one of the strongest recorded near Sungai Penuh. Regional monitoring indicates persistent seismic activity tied to the subduction process, with aftershocks and smaller events delineating the rupture area. Updated seismic hazard assessments continue to classify the Mentawai segment as capable of future great earthquakes due to accumulated strain.

Infrastructure in Sungai Penuh experienced moderate shaking, prompting reviews of building codes in this tectonically active highland area. The event underscores the need for tsunami preparedness in coastal districts west of the city, where travel times from the source can be under 30 minutes.

References

USGS Earthquake Catalog (event details and location data)
Global CMT Project (focal mechanism and depth)
Indonesian Meteorological, Climatological, and Geophysical Agency (BMKG) reports on regional tectonics